如图,花丛中有一路灯杆AB.在灯光下,小明在
1.7/AB=DE/BE=DE/(BD+DE)=3/(BD+3) 1.7/AB=GH/BH=GH/(BD+DG+GH)=5/(BD+10) ∴3/(BD+3)=5/(BD+10) 解得,BD=7.5 ∴AB=1.7(BD+3)/3=1.7×(7.5+3)/3=5.95m
1.7/AB=DE/BE=DE/(BD+DE)=3/(BD+3) 1.7/AB=GH/BH=GH/(BD+DG+GH)=5/(BD+10) ∴3/(BD+3)=5/(BD+10) 解得,BD=7.5 ∴AB=1.7(BD+3)/3=1.7×(7.5+3)/3=5.95m